This is my Browning HiPower with factory hard chrome finish. The problem is that there's some sort of stain on the hard chrome that I cannot wipe off. It is not very visible in photo or in person, but if I look at it very closely, it's there, while other areas are stainfree. the stain is a very slight yellow outline, I have no idea how they came to be.

Does anyone know more about this? or how to remove it? Thanks in advance.